In PvE, the probability of eventual success is 100%. Stuff is designed to be beaten (for example, xp only goes upward, so if all else fails, just kill an easy enemy over and over), so of course it will be, given enough time. The only thing you can do is make it go faster.
For the rest of your post, I can't make sense of what you are saying. I fail to see how persistent vs. finite goals would matter. Are you saying that the xp booster would be a problem for you if there was an infinite level "cap" instead of 80 being the max level?
They put in elite armor skins in the GW1 cash shop, skins that were only obtainable through said cash shop. Was that a problem for you?
I didn't make the following image, but I think most of it is true. I do disagree on the character slots and the bank tabs; those are ok to sell I think. Not the bag slots though.